Conduit joint



. May 25 1926. 1,586,002

- J. E. MILLER CONDUIT JOINT Filed June 26, 1924 Patented May 25, 1926.

U 1 155.1"; g AT Josnrn n. MILLER, or DESTMOINES, IOWA.

connurr Joints.

A lication filed June 26, 1924. serial No. 722,578.

The object of my invention is to provide aconduit consisting of sections having spigot and bell ends adapted to coact with an adjacent section for forming pocket at the joint capable of being iilled with plastic material for forming a tight joint.

In the type of conduit that is made of cement, the conduit is of considerable diameter, and it is desirable that the joint formed by adjacent conduit sections may be lilled with plastic material from the inside, and I provide the bell end of the conduit section with an annular groove near its inner surface and with an outwardly inclined surface on the spigot end of the conduit near the inner surface of the section, whereby a pocket of considerable size is formed between the adjacent spigot and bell ends of adjacent conduits, The pocket thus formed can be filled with soft cement from the inside of the sections.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claim, and illustrated in the accompanying drawings, in which:

Figure 1 is a plan view of adjacent conduits, parts being broken away and shown in section to show the spigot and bell ends of the conduit.

Figure 2 is a sectional view taken on line 22 of Figure 1 showing an enlarged view of the joint filled with plastic material.

Figure 3 is a sectional view through the joint of adjacent conduits with a collar arranged on the inner surface to illustrate how the pocket or joint may be poured with plastic material from the outside of the conduit.

In the accompanying drawings, I have used the reference numeral 10 to indicate generally a concrete conduit section provided with a spigot end 11 and a bell end 12.

The spigot end 11 is provided with an upwardly and inwardly inclined shoulder 13 which receives a projecting end 1 1 formed near the outer periphery of the conduit 10 at the bell end, and having an upwardly and outwardly inclined surface adapted to coact with the inclined shoulder 13 on the spigot end 11. The spigot end 11 is provided with an inwardly inclined surface 15, which commences at the inner surface of the conduit and extends to the shoulder 13, as clearly illustrated in Figure 2 of the drawings. p

I The bell end of theconduit 10, below the pro ection 1-1, is provided with a curved surface so as to provide a groove 16. The groove 16 commences from the inner surface of the conduit 10 and extends to the projection 14.

The inner, adjacent ends of two of the conduits are spaced apart, as clearly shown in Flgure 2 of the drawings, while the outer adjacent preferably vertical edges or ends abut against each other to form a close joint. The groove 16 in the bell end of the conduit is spaced away from the inclined surface 15 so that a pocket is formed between them, the adjacent edges of the two sections at the in nor surface being slightly spaced apart to afford access to the pocket.

Plastic material 17 may be poured or pushed into the pocket between the adjacent conduit from the opening between the inner adjacent ends of the conduit.

Tie annular groove 16 and the inclined surface 15 form a pocket of such shape that after the plastic material hardens it will not fall out. i

The particular advantage of the inwardly inclined surface 15 is the fact that it is very easy to push cement therein, because the inclined surface does not provide any obstruction.

In Figure 3 of the drawings, I have shown a collar 18 placed on the inner side of the conduit at the joints thereof, and in that case, a small portion of the projection 14, as at 19, is broken out so that soft cement may be poured therethrough and into the pocket formed by the groove 16, and the inclined surface 15.

After the cement hardens, the collar 18,

may be removed therefrom at the broken out portion, as at 19, and cemented up.

The making of the spigot end with an inclined surface 15 not only gives me a joint between the conduit, but gives me a structure that can be conveniently and coinmercially manufactured.

It is understood that the term conduit here used, refers to each of the sections of the pipe, which taken as a whole form the conduit. y

' Some changes may be made in the" con.

struetion and arrangement of the Various parts of: my invention, without departing .i'rom the real spirit and purpose of my invention, and it is my intention to cover by my claim, any modified forms of structure or use of mechanical equivalents, which may be reasonably included within its scope.

I claim as my invention:

A joint having conduit sections, one section havinga hell. end and the other section a spigot end, the hell end having an annular groove adjacent to the inner surface of the conduit, a projection overhanging said groove and having an upwardly inclined inner surface into which said groove merges, the spigot end having a projection adjacent to the inner surface of the conduit having an upwardly and inwardly inclined end and an upwardly and inwardly inclined shoulder, the hell end and spigot end adapted to be fitted together With their projections 0verlapping and closely fitted to each other and alter-ding;- a tight joint at the outer surface of the conduit and with the inclined end surface of the projection on the spigot end spaced from the groove in the hell end, to afford an inwardly opening pocket adjacent to the inner surface of the conduit, and a cement filling adapted to be inserted in said pocket.

JOSEPH E. MILLER. 

